为什么.NET不使用嵌入的IPv4值解析特定的IPv6?

在我的计算机中,此代码:

        var someIps = new[]
        {
            "::1.2.3.4",
            "::0000:1.2.3.4",
            "0:0:0:0:0:0:0000:1.2.3.4",
            "1::0000:1.2.3.4",
            "0000:0000:0000:0000:0000:0000:0000:1.2.3.4",
            "::abcd:1.2.3.4",
            "0:0:0:0:0:0:abcd:1.2.3.4",
            "1::abcd:1.2.3.4",
            "0000:0000:0000:0000:0000:0000:abcd:1.2.3.4",
            "::ffff:1.2.3.4",
            "0:0:0:0:0:0:ffff:1.2.3.4",
            "1::ffff:1.2.3.4",
            "0001:0000:0000:0000:0000:0000:ffff:1.2.3.4",
        };

        foreach ( var ip in someIps )
        {
            if (IPAddress.TryParse( ip, out var parsed ))
                Console.WriteLine( "{0} parses to {1}", ip, parsed );
            else
                Console.WriteLine( "{0} does not parse.", ip, parsed );
        }

生成此输出:

::1.2.3.4 parses to ::1.2.3.4
::0000:1.2.3.4 parses to ::1.2.3.4
0:0:0:0:0:0:0000:1.2.3.4 does not parse.
1::0000:1.2.3.4 parses to 1::102:304
0000:0000:0000:0000:0000:0000:0000:1.2.3.4 does not parse.
::abcd:1.2.3.4 parses to ::abcd:102:304
0:0:0:0:0:0:abcd:1.2.3.4 does not parse.
1::abcd:1.2.3.4 parses to 1::abcd:102:304
0000:0000:0000:0000:0000:0000:abcd:1.2.3.4 does not parse.
::ffff:1.2.3.4 parses to ::ffff:1.2.3.4
0:0:0:0:0:0:ffff:1.2.3.4 does not parse.
1::ffff:1.2.3.4 parses to 1::ffff:102:304
0001:0000:0000:0000:0000:0000:ffff:1.2.3.4 does not parse.

为什么要分析 ::ffff:1.2.3.4 ,但无法分析 0:0:0:0:0:0:ffff:1.2.3.4 ?他们不应该是同一个地址吗?

IPv6表示中是否缺少使这些字符串无效的内容?或者我刚刚在[ipaddress.typarse][1]中发现了一个bug?